1. Family: Araceae Juss.
    1. Genus: Amorphophallus Blume ex Decne.
      1. Amorphophallus pygmaeus Hett.

        This species is accepted, and its native range is Thailand.

    [CATE]

    CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

    Diagnostic

    Amorphophallus pygmaeus resembles  A. parvulus Gagnep. but the appendix is shorter and thicker, the stigmas often hemispheric. Compared with  A. brevispathus Gagnep. it has much smaller leaves, a smaller spadix and the connective does not rupture at anthesis.

    Distribution

    South Western Thailand: Prachuap Khiri Khan. Endemic.

    General Description

    Tuber shortly elongate, or globose.  Leaf solitary;  petiole smooth, 10-40 cm long, 0.5-1 cm in diam. (base), uniformly reddish brown or pale olive brown;  lamina moderately dissected, 10-25 cm in diam., rhachises narrowly winged only in the distal branches;  leaflet:; elliptic-lanceolate, obovate or oblong, base long or short decurrent or constricted, 3-10 cm long, 1-6 cm in diam., upper surface very dark velvety green, lower surface flushed with purple-red.  Inflorescence solitary, long peduncled;  peduncle as petiole but longer, 18-36 cm long, 0.5-0.8 cm in diam. (base);  spathe triangular, base shortly convolute and with rather strong concave sides, top acute, 1.5-6 cm long, 1.5-4 cm in diam., outside and inside creamy white or pinkish white, base within dirty brownish red and with scattered or numerous fleshy, shortly elongate, irregularly branched or laterally flattened warts.  Spadix sessile, longer than spathe, 5-8 cm long;  female zone shortly cylindric, 0.5-0.8 cm long, 0.4-0.5 cm in diam., flowers congested or slightly distant;  male zone fusiform, fusiform-obconic or slightly conic, 2-3 cm long, 0.4-0.9 cm in diam., flowers congested;  appendix elongate-fusiform, smooth, very pale green or creamy white, top obtuse, 2.5-4 cm long, 0.4-0.9 cm in diam., producing a heavy gaseous smell at female an thesis.  Ovaries depressed, diamond-shaped, angulate or circular in cross section, 2.5 mm in diam., 1-1.4 mm high, pale green, unilocular;  style short, 0.3- 0.7 mm long, c. 1 mm in diam., pale green;  stigma hemispheric or flattened, slightly angulate in cross section, 1-1.8 mm in diam., 0.5 mm high, very shallowly multilobed and with a shallow central depression, surface verruculate, dirty creamy white.  Male flowers consisting of 3-8 stamens;  stamens c. 1 mm long;  filaments c. 0.6 mm long, entirely connate;  anthers angulate in cross section, truncate, c. 0.4 mm long, 0.5-2 mm in diam., white with a pale greenish hue, pores apical, oval at anthesis.  Pollen striate.

    Tuber shortly elongate, or subglobose, often somewhat irregular, rarely (young tubers) depressed globose, rarely branched, ca 2–6 × 1.5–9 cm. Leaf solitary; petiole 10–40 cm × 0.5–1.5 mm, smooth, uniformly reddish brown or pale olive-brown; leaf blade moderately dissected, 10––55 cm, rachises narrowly winged distally from the main branching-points; leaflets elliptic-lanceolate, obovate or oblong, 3–13 × 1.0–7 cm, base long or short decurrent or constricted, upper side very dark velvety bluish green with a reddish margin, lower side flushed iridescent purple-red. Inflorescence solitary, long pedunculate; peduncle appearance as petiole or paler, 18–42 × 0.5–1 cm; spathe triangular, base convolute and with rather strong concave sides, top acute, 1.5–10 × 1.5–9 cm, outside and inside creamy white or pinkish white, base within dirty brownish red and with scattered or numerous fleshy, shortly elongate, irregularly branched or laterally flattened warts; spadix sessile, longer than spathe, 5–14.5 cm long; pistillate flower zone shortly cylindrical, 0.5–1.5 × 0.4–1 cm, flowers congested or slightly distant; ovaries depressed, diamond-shaped, angular or circular in cross-section, 2.5 × 1–1.4 mm, pale green, unilocular; style short, 0.3–0.7 × ca 1 mm, pale green; stigma hemispherical or depressed, slightly angular in cross-section, 1–1.8 mm × 0.5 mm high, very shallowly multilobed and with a shallow central depression, surface verruculate, dirty creamy white; staminate flower zone fusiform, fusiform-obconical or slightly conical, 2–5 × 0.4–1.3 cm, flowers congested; staminate flowers 3–8-androus; stamens ca 1 mm long; filaments ca 0.6 mm long, entirely connate; stamens white with a pale greenish hue, pores apical, oval at anthesis; appendix elongate-fusiform, smooth, very pale green or creamy white, top obtuse, 2.5–8 × 0.4–1.3 cm, producing a heavy gaseous smell at pistillate anthesis. Infructescence globose; fruit ovate-lageniform, ca 10 × ca 6 mm, maturing from green to white, one-seeded; seeds ovate, ca 9 × 5 mm, seed coat bright green.

    Habitat

    Medium-shaded, humus-filled crevices and pockets on limestone, 50–500 m asl.

    Images

    Distribution

    Native to:

    Thailand

    Amorphophallus pygmaeus Hett. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Feb 10, 1994 Kerr, A.F.G. [10958], Thailand K000457213
    Jan 1, 1994 Kerr, A.F.G. [10958], Thailand K000291375 syntype
    Jan 1, 1992 Kerr, A.F.G. [19473], Thailand K000457212
    Bogner [1948] 59079.000

    First published in Blumea 39: 271 (1994)

    Accepted by

    • Boyce, P.C., Sookchaloem, D., Hetterscheid, W.L.A., Gusman, G., Jacobsen, N., Idei, T. & Nguyen, V.D. (2012). Flora of Thailand 11(2): 101-325. The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok.
    • Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.
    • Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 1-529. MIM, Deurne.

    Literature

    CATE Araceae
    • Hetterscheid, W.L.A. Notes on the genus Amorphophallus (Araceae): 2. New species from tropical Asia. Blumea 39, 237–281 (1994).

    Sources

    CATE Araceae
    Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0